Sheetgood grades and flatness

I need some flat sheet goods. I believe that baltic birch is considered to be reliable in terms of its flatness (although it is not always the thickness it is advertised to be…that is OK for me). Are there any lesser grades of sheet goods that are also reliably flat?

I like Appleply better than the baltic birch for flatness. There is 3/4” ply available now which has 1/8” layers of mdf under the surfaceveneers. While it does make it heavier, it’s pretty flat stuff for ply.

Call a plywood specialty dealer (in the b2b phone book at the libraryif internet searches don’t work for you). The brands dealerscarry vary but if you explain your criteria they’ll very likely havesomething. The prices are often pretty good too.